A system for providing ventricular assistance to a heart of a subject, the system including a balloon configured to be inserted into a ventricle of the heart, wherein the balloon is configured to differentially inflate to thereby urge blood towards a semilunar valve of the ventricle； a fluid conduit in fluid communication With the balloon； a pumping mechanism attached to the fluid conduit； and, a controller configured to control the pumping mechanism to thereby selectively supply fluid into the balloon so as to inflate the balloon at least partially in accordance With the cardiac cycle.
